/*
 * Copyright 2016 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import Foundation

/**
 Protocol for handling block-level connection logic. Can be overridden for custom logic and passed
 into the workspace for application-specific behaviors.
 */
public protocol ConnectionValidator {
  /**
   Check if the two connections can be dragged to connect to each other.

   - parameter moving: The connection being dragged.
   - parameter candidate: A nearby connection to check. Must not be mid-drag.
   - returns: True if the connection is allowed, false otherwise.
   */
  func canConnect(_ moving: Connection, toConnection candidate: Connection) -> Bool
}
